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Why convert FTS to ICO?
Fast
Your file is converted in under 30 seconds in our cloud.
Secure
Files are automatically deleted after 1 hour.
Quality preserved
Maximum quality preserved during conversion.
About the FTS format
FTS — Flexible Image Transport System (FITS)
FITS (Flexible Image Transport System) is the standard format used in astronomy for storing scientific data, images, and tables. Developed by NASA and the IAU, it is the universal format for telescope observations, space mission data, and astronomical image archives.
Common uses
- Astronomical image and data storage
- Telescope and space mission image archives
- Scientific image analysis in astrophysics
- Converting telescope data to viewable formats
About the ICO format
ICO — Windows Icon
ICO is the standard icon format for Windows, storing one or more images at different resolutions within a single file. Modern ICO files can contain high-resolution PNG-compressed images alongside traditional BMP frames for compatibility across all Windows versions.
Common uses
- Windows application and file type icons
- Website favicon (favicon.ico)
- Windows shortcut and executable icons
- Cross-resolution icon sets for Windows UI
Related conversions
Other conversions available for FTS and ICO files
Frequently asked questions
Is the conversion free?
Yes, basic conversion is completely free. For large volumes, check out our paid plans.
What is the maximum file size?
Free accounts can convert files up to 25 MB. Pro accounts up to 100 MB.
How long are my files kept?
Files are automatically deleted after 1 hour on the free plan, 24 hours on Pro.
What formats are supported?
We support over 200 source and target formats. See our complete formats page.